title: Longitudinal construct validity of the Health Utilities Indices Mark 2 and Mark 3 in hip fracture.
abstract: OBJECTIVE
  The objective of this study is to evaluate the longitudinal construct validity of the Health Utilities Index Mark 2 (HUI2) and Health Utilities Index Mark 3 (HUI3) using a convergent/divergent validity approach in patients recovering from hip fracture, with the Functional Independence Measure (FIM) as the comparator.
  
  
  METHODS
  A total of 278 patients with a primary diagnosis of hip fracture were interviewed 3-5 days after surgery and then at 1 and 6 months using the HUI2, HUI3 and the FIM and a Likert-type rating of hip pain. A priori hypotheses were formulated. Convergent and divergent correlations between HUI2, HUI3 and FIM change scores for the baseline to 1-month and baseline to 6-month intervals were examined.
  
  
  RESULTS
  Overall HUI2 detected continued gain in health-related quality of life between 1 and 6 months after fracture, as the change increased from 0.20 to 0.29 units. The correlation between change in the overall HUI2 score and total FIM score was moderate (r = 0.50) over the 6-month interval, but larger than the observed correlation over the 1-month interval (r = 0.36). The correlation between change in overall HUI3 score and total FIM over the 1-month interval was small (r = 0.32), and the correlation between change in overall HUI3 score and total FIM was moderate (r = 0.37) over the 6-month interval. All hypotheses for the divergent correlations were supported.
  
  
  CONCLUSIONS
  Weaker correlations were reported for change over 1 month as compared to change over the 6 months after fracture. Findings supported the longitudinal construct validity of the overall HUI2 and HUI3 for the assessment of recovery following hip fracture, particularly for change over the 6 months following fracture.
authors.affiliation: Department of Physical Therapy, Faculty of Rehabilitation Medicine, University of Alberta, 2-50 Corbett Hall, Edmonton, AB, T6G 2G4, Canada, cajones@ualberta.ca.
authors.forename: C Allyson
authors.initials: CA
authors.lastname: Jones
authors.forename: Sheri L
authors.initials: SL
authors.lastname: Pohar
authors.forename: David H
authors.initials: DH
authors.lastname: Feeny
authors.forename: Ken
authors.initials: K
authors.lastname: Eng
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000416:Alberta; D005260:Female; D005500:Follow-Up Studies; D006305:Health Status Indicators; D006620:Hip Fractures / Q000523:psychology* / Q000534:rehabilitation; D006801:Humans; D007407:Interviews as Topic; D008137:Longitudinal Studies; D008297:Male; D008609:Mental Status Schedule; D010147:Pain Measurement; D063868:Patient Outcome Assessment; D011446:Prospective Studies; D011594:Psychometrics / Q000379:methods / Q000592:standards*; D011788:Quality of Life; D015203:Reproducibility of Results; D012648:Self Care / Q000523:psychology; D011795:Surveys and Questionnaires; D013997:Time Factors